112 . POTTSVILLE FAUNA OP OHIO 



Crinoid segments 



Chonetes mesolobus Norwood and Pratten 



Productus semireticulatus (Martin) 



Pustula nebraskensis (Owen) 



Marginifera muricata var. missouriensis Girty 



Marginifera wabashensis (Norwood and Pratten) 



Spiriferina kentuckyensis (Shumard) 



Spirifer opimus Hall 



Squamularia perplexa (McChesney) 



Composita subtilita (Hall) 



Composita sp. 



Acanthopecten carboniferous (Stevens) 

 Naticopsis nanus (Meek and Worthen) 



Outcrops 2 feet in thickness occur also in the vicinity of Lowell- 

 ville but no fossils were collected. 



Columbiana County. The Upper Mercer member comprises the 

 oldest rocks in Columbiana County and is found only in Section 12, 

 St. Clair Township. The geologic section below was measured near 

 the mouth of Bieler Run, in the northern part of Section 12, St. Clair 

 Township, and shows the character of the Upper Mercer limestone in 

 that vicinity. 



Strata exposed near the mouth of Bieler Run, Section 12, St. Clair Town- 

 ship, Columbiana County 



Feet Inches 



Coal, Lower Kittanning 1 10 



Clay, gray, plastic 7 2 



Clay, shaly 1 



Clay, dark __ 10 



Clay, gray, plastic 5 5 



Sandstone, shaly, and shale, siliceous 25 



Shale and covered 23 8 



Shale, black, f ossilif erous *1 1 4 



Shale, gray, siliceous ? Vanport < 8 2 



Ore, nodular, f ossilif erous J t__ 2 



Shale and shaly sandstone 8 2 



Clay, plastic, siliceous, Clarion 6 



Sandstone, thin-bedded to shaly 28 6 



Clay shale, dark, with thin layers of shaly coal _ _ 8 



Sandstone, hard, blue __ 11 



Shale with parts covered 14 



Limestone, ferruginous, f ossilif erous "I jj pper Mercer . -f ~ ' 5 



Shale, calcareous, very f ossilif erous I "\ __ 2 



Clay.shaly. 3 



Shale 10 



Fossils were collected at two places in Section 12, St. Clair Town- 

 ship; those listed below were obtained along Little Beaver Creek, 

 about one-fourth mile south of Bieler Run (Locality 77): 



